JPH07167322A - Time delay closing air valve - Google Patents

Abstract

PURPOSE:To obtain a time delay closing air valve with a unitary construction and suitable for small number production, which is operated for opening a flow passage by manual operation and closed automatically after a specified time. CONSTITUTION:A cylinder port 3 formed with a valve seat 5 at the end is formed on a block-like main body 1. A piston 27 having a valve body 26 at the end is energized to the end side by means of a spring 28 and fitted to the cylinder port. A front chamber 29 is formed by the gap between the cylinder port 3 and the valve body 26. A rear chamber 31 is formed at a rear side of the piston 27. The front chamber 29 is communicated with the rear chamber 31 by an air flow passage 4 provided with a governing valve 19 for adjusting a flow rate of passing air. A manual valve 24 of automatic resetting is provided for releasing the rear chamber 31 to atmosphere. An inlet port 12 is communicated with the front chamber 29, while an outlet port 13 is communicated with an end of the cylinder port 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to stop the air supplied to an air duster for cleaning the surface of small parts by means of jet air, an air gun for spray painting, etc., after a certain time from the start of jetting. It concerns an air valve.

[0002]

2. Description of the Related Art When performing air dust to remove chips and the like adhering to the surface of a component in the manufacturing process of the component, when starting and stopping the injection of an air gun that injects air onto the surface of the component by manual operation, Since the air gun must be replaced and the parts must be released in order to operate the air gun, work cannot be performed efficiently. In such a case, it would be convenient to have a device in which the air injection is started just by touching it with a hand holding the parts and the air injection is stopped after a lapse of a certain time.

Conventionally, as a time-delayed air valve, a time-delayed valve is known in which a main valve operates after a lapse of a fixed time after a built-in pilot valve is operated, and such valves are used in combination. Thus, although it is possible to configure the device as described above, the structure becomes complicated and the weight of the device becomes heavy.

A flush valve of a flush toilet is known as a valve that opens a flow path by a manual operation and closes after a lapse of a certain time. However, a conventional valve of this type is a valve for liquid and can be used as it is as an air valve. In addition, there is a problem that it is not suitable for small-scale production due to its structure.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention is a time-closed type having a unitary structure in which a flow path is opened by a manual operation and automatically closed after a predetermined time and which is also suitable for small-volume production. The challenge is to get an air valve.

[0006]

A time-closed air valve according to the present invention has a block-shaped main body 1 provided with a cylinder hole 3 having a valve seat 5 having a diameter smaller than the hole diameter at the tip thereof. A piston 27 having a valve body 26 is mounted by urging it toward the tip end side by a spring 28.
The front chamber 29 is formed by the gap between the valve body 26 and the valve body 26, and the rear chamber 31 is formed at the rear portion of the piston 27. The front chamber 29 and the rear chamber 31 adjust the flow rate of passing air.
9 is provided to communicate with the air flow path 4, and an automatic return type manual valve 24 for opening the rear chamber 31 to the atmosphere is provided.
9, an inlet port 12 communicating with 9 and an outlet port 13 communicating with the tip of the cylinder hole 3 are provided.

[0007]

In the air valve having the above structure, the inlet port 12 is used for communicating with the air pressure source and the outlet port 13 is used for communicating with, for example, the air nozzle 39 of the air duster. The adjusting valve 19 is set in advance according to the time required for the work. In the non-operating state shown in FIG. 2, with the manual valve 24 closed, the front chamber 29 and the rear chamber 31 are communicated with each other via the adjusting valve 19 and the air flow path 4, and the pressures of both chambers are brought into the inlet port 12. The applied air pressure is applied to the piston 2 due to the biasing force of the spring 28 and the area difference between the front chamber side and the rear chamber side of the piston 27 (the front chamber side is small by the flow passage area connecting to the outlet port).
7 is biased to the front chamber side, and the valve body 26 abuts the valve seat 5 to close the flow path connecting the front chamber 29 to the outlet port 13.

When the manual valve 24 is opened in this state, the rear chamber 31
Is released to the atmosphere, the piston 27 retracts due to the air pressure acting on the front chamber 29, the valve body 26 separates from the valve seat 5, and the air flows from the inlet port 12 through the front chamber 29 to the outlet port 13. (See Figure 1). Since the air pressure in the front chamber 29 at this time is higher than the atmospheric pressure, the piston 27 continues to be urged to the rear chamber side and flows into the rear chamber 31 side through the adjusting valve 19. The operating force of the manual valve 24 is released and the manual valve 2
When 4 is returned and closed, the rear chamber 31 is sealed, and the air that has passed through the adjusting valve 19 gradually flows into the sealed rear chamber to increase the pressure in the rear chamber 31. The pressure in the rear chamber 31 is the front chamber 2
When the pressure approaches 9, the piston 27 moves to the front chamber side by the urging force of the spring 28, so that the valve body 26 moves toward the outlet port 1.
Shut off the entrance of 3. Therefore, the air valve of the present invention is
After the manual valve 24 is opened and air is ejected from the air nozzle 39 or the like by operating the manual valve 24, the operating force of the manual valve 24 is released, and after a fixed time determined by the adjustment amount of the adjusting valve 19 has elapsed automatically. It is closed and air injection from the air nozzle 39 and the like is also stopped.

[0009]

1 and 2 are sectional views showing an embodiment of the air valve of the present invention. The main body 1 is made of a rectangular metal block, and the cover 2 is fixed to the end surface on the right side of the drawing by a bolt (not shown). From the right side of the drawing, a cylinder hole 3 and an air flow path 4 having a smaller diameter than the cylinder hole are bored in parallel with each other in the main body 1, a valve seat 5 having a tapered surface is formed at the tip of the cylinder hole 3, and A short outlet channel 6 is drilled on the central extension of the hole 3. The processing of these holes 3, 4, 6 and the valve seat 5 is performed from the end surface of the main body 1 on the right side in the drawing.

From the lower surface of the body 1 in the drawing, the cylinder hole 3
The inlet flow passage 8 and the outlet flow passage 9 which communicate with the peripheral surface on the tip end side and the side surface of the outlet flow passage 6 are perforated, and screw holes 10 and 11 are provided at the openings of these flow passages to form the inlet port 12.
And an outlet port 13 is formed. Further, a regulating valve hole 14 and a manual valve hole 15 are bored from the upper surface of the main body 1 in the figure, and the regulating valve hole 14 becomes a small hole 16 after penetrating the tip end portion of the air flow path 4 and becomes the tip end periphery of the cylinder hole 3. The manual valve hole 15 penetrates the air flow path 4 and opens on the peripheral surface of the cylinder hole 3 on the base end side.

In the adjusting valve hole 14, the tip end of a valve rod 18 whose base end is screwed into a nut member 17 attached to the upper end opening of the adjusting valve hole 14 faces a small hole 16 in the penetrating portion between the air passage 4 and the cylinder hole 3. The adjusting valve 19 is formed in this part. Manual valve hole 15
A valve seat is formed by a valve lid 20 attached to the upper end opening of the valve seat, and a valve rod 22 biased outward by a spring 21 is inserted through the valve seat 23. Are in contact with each other to form an automatic return type manual valve 24.

A piston 27 having a valve body 26 having a diameter smaller than that of the cylinder hole is fitted into the cylinder hole 3, and a compression spring 28 is interposed between the rear end of the piston 27 and the cover 2. The cylinder hole 3 and the air flow path 4 are closed by the cover 2. The inlet port 12 and the adjusting valve hole 14 are opened in a gap portion between the tip end portion of the cylinder hole 3 and the valve body 26 in a state where the tip end of the valve body 26 is in contact with the valve seat 5 by the urging force of the spring 28. This gap portion forms the front chamber 29 of the piston 27. Further, the manual valve hole 15 is opened on the side surface of the cylinder hole 3 behind the piston 27 even when the piston 27 retreats against the urging force of the spring 28 due to the air pressure acting on the front chamber of the piston 27. A space between the rear surface of the piston 27 and the cover 2 that accommodates the spring 28 is a rear chamber 31.

The operation of the air valve described above is as described in the above section. In the embodiment shown in the figure, the knob 32 provided at the protruding end of the valve stem 18 of the regulating valve is rotated to move the valve stem 18 forward and backward, whereby the flow rate of the air flowing from the front chamber 29 to the rear chamber 31 is increased. Adjusted and the manual valve 24 is opened by pushing its valve rod 22 open to the rear chamber 31 to the atmosphere and closed by releasing the pushing force.

Although the inlet port 12 and the outlet port 13 are provided on the lower surface of the main body 1 in the illustrated embodiment, it is of course possible to provide the inlet port 12 and the outlet port 13 on the side surface of the main body 1 on the front side or the rear side of the figure.

FIG. 3 shows an example of an air duster provided with the air valve 35 of the present invention. This air duster is used by being fixedly placed on a workbench, and at the upper end of a column 37 erected on a stand 36, via a piping block 38,
A downward air nozzle 39 is provided. The air valve 35 of the present invention is fixed on a base 36. Entrance port 1
2 and the outlet port 13 are opened on the side surface of the air valve body 1, the air pipe 40 communicated with an air source is connected to the inlet port, and the outlet port 13 is connected to the air pipe 41.
Through a pressure reducing valve 42 mounted on the piping block 38. The pressure reducing valve 42 adjusts the force of the air ejected from the air nozzle 39 by adjusting the setting knob 43. Air valve adjustment valve knob 32
Also, the tip of the valve rod 22 of the manual valve is located on the upper surface of the air valve body 1, and the pin 4 is provided above the valve rod 22 of the manual valve.
Push lever 45 pivotally attached to the air valve body 1 at 4
Are arranged. The push lever 45 is located below the air nozzle 39.

The work of cleaning the processed parts using the air duster of FIG. 3 is performed as follows. First, the adjustment valve 19 of the air valve is adjusted according to the size of the parts and the like, and the injection time of the air from the air nozzle 39 is set. If necessary, the pressure reducing valve 42 is adjusted to adjust the force of the air jetted from the air nozzle 39 depending on, for example, the state of attachment of dust to the parts. Then, the parts are brought under the air nozzle by hand, and the push lever 45 is pushed down by hand while holding the parts to open the manual valve 24 of the air valve. As a result, the air valve 35 is opened and the air nozzle 3
Since air is jetted from 9, the surface of the component is uniformly exposed to the jetted air to clean the surface of the component. When the cleaning is completed, the parts are taken away, the air valve 35 is automatically closed thereafter, and the air jet from the air nozzle 39 is also stopped. Therefore, according to the air duster of FIG. 3, it is possible to clean the surface of the component without releasing the hand from the component.

[0017]

The air valve of the present invention described above is
The valve is opened by a simple operation, and the valve automatically closes after a certain period of time has passed after the valve operating force has been released.For example, by using it as a manually operated valve for an air duster or an air gun of a spray coating device, the parts can be cleaned. Work and painting work can be performed efficiently with simple operations. In addition, since the structure is simple and lightweight, it can be easily installed in various kinds of conventionally used devices, and can be easily manufactured and provided at a low cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an operating state of an air valve of the present invention.

FIG. 2 is a cross-sectional view showing a non-operating state of the air valve of the present invention.

FIG. 3 is a perspective view showing an example of an air duster using the air valve of the present invention.

[Explanation of symbols] 1 Main body 3 Cylinder hole 4 Air flow path 5 Valve seat 12 Inlet port 13 Outlet port 19 Adjusting valve 24 Manual valve 26 Valve body 27 Piston 28 Compression spring 29 Front chamber 31 Rear chamber 35 Air valve

Claims (1)

[Claims] 1. A block-shaped main body (1) is provided with a cylinder hole (3) having a valve seat (5) having a diameter smaller than the hole diameter at its tip, and this cylinder hole has a valve body (26) at the tip. The piston (27) is urged and fitted by the spring (28) toward the tip side, and the front chamber (29) is formed by the gap between the cylinder hole (3) and the valve body (26) and the piston ( A rear chamber (31) is formed at the rear of the (27), and the front chamber (29) and the rear chamber (31) are formed by an air flow path (4) provided with a regulating valve (19) for regulating the flow rate of passing air. An inlet port (12) and a cylinder hole that communicate with the front chamber (29) are provided with an automatic return type manual valve (24) that opens the rear chamber (31) to the atmosphere.
A time-closed air valve having an outlet port (13) communicating with the tip of (3).